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Stonybrook, Pennsylvania Weather

Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →

Stonybrook weather forecast — hour by hour, 7-day outlook, NOAA radar

Stonybrook, PA
Saturday, July 4 at 10:05 PM
80
°
Light Rain
Feels like
81°
Humidity
51%
Wind
6 mph
Sunrise
1:43 AM
Sunset
4:38 PM
Stonybrook, PA
Hour by hour · 24h
24-Hour ForecastStonybrook, PA: 24-hour forecast. Temperatures range from 72 to 93 degrees Fahrenheit with a 55% chance of precipitation at 7 PM.
L 72°H 93°
Stonybrook, PA
7-day forecast
  1. Today
    Jul 4
    Light Drizzle
    46%
    0.02″
    100°77°—
  2. Sunday
    Jul 5
    Heavy Showers
    58%
    1.8″
    93°72°-7°
  3. Monday
    Jul 6
    Thunderstorm
    94%
    0.03″
    80°66°-13°
  4. Tuesday
    Jul 7
    Light Showers
    83%
    0.01″
    70°66°-10°
  5. Wednesday
    Jul 8
    Light Drizzle
    19%
    0.01″
    72°62°+2°
  6. Thursday
    Jul 9
    Light Drizzle
    12%
    —
    89°65°+17°
  7. Friday
    Jul 10
    Overcast
    48%
    —
    90°70°+1°
Stonybrook, PA
Next 24 hours · Mild now
HOT 90°68°83°98°6p12a6a12pnow 80°high 93°low 72°PRECIP %
Stonybrook, PA
Anemometer · 24h winds · from true
NESW
From · True
WSW
244° · veering 25°
Direction
WSW
244°
Sustained
6
mph
Gust
11
mph
Peak 24h
37
avg 7
Beaufort · 2 · LIGHT BRZ
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
avg 7 · pk 37 @ 8:00p
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 178SUSTGUST
−24h−18h−12h−6hnow
Light breeze veering 25° from the wsw.
Stonybrook, PA
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
999.8
+2.6 mb in 3h · rising rapidly · 29.52 inHg
Now
999.8
mb
3h
+2.6
mb
12h
-0.8
mb
24h
-1.0
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 997–1001
9909951000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR10201025FAIR|DRY1030-21h-18h-15h-12h-9h-6h-3h-24hNOW1000.8996.7999.8
−24h−18h−12h−6hnow
The low is filling — pressure climbing out of storm territory.
Stonybrook, PA
Air quality
76
AQI
Moderate
↓-11 in 6h

AQI 76 (Moderate), driven by Ozone. AQI down 11 over the last 6 hours (gradual decline). Ozone at AQI 45 now. With UV 0.0 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 8 around 1 PM.

OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.

PM 2.5Good
8.0μg/m³
PM 10Good
8μg/m³
NO₂Good
10μg/m³
OzoneDRIVERModerate
96μg/m³
UV IndexLow
0.0

What's driving it

Ozone × UV × Sky

Ozone at AQI 45 now. With UV 0.0 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 8 around 1 PM.

Present
AQI 45
UV peak
0.0 at 1 PM
Sky at peak
partly cloudy
Projected peak
AQI 8

PM × Wind × Precip

PM scrubbed by 2 hours of recent rain — PM2.5 down to 8.0 µg/m³, PM10 to 8.3 µg/m³.

PM2.5/PM10
0.96
Wind
light
Recent rain
2h in last 6h
Pattern
washed out

Trends

Seven days of AQI and PM2.5.

Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).

7-DAY AQI TREND50100SUNMONTUEWEDTHUFRISATSUN7-DAY PM2.5 TREND · μg/m³350
Stonybrook, PA
Sky cover · visibility · 24h
Cloud cover
100%
OVERCAST
100%0%−24h−18h−12h−6hnow
Visibility
19.0mi
UNLIMITED
126 mi0 mi−24h−18h−12h−6hnow
Earth · GOES-19 ABI
Full Disk · Visible · GeoColor
GOES-19 full disk Visible · GeoColor
True-color daytime, blue/IR sandwich at night
02:05 UTC · Stonybrook, PA · NOAA NESDIS / STAR · up to 10848 px
Continental US · GOES-19 ABI
CONUS Sector · Visible · GeoColor
GOES-19 CONUS Visible · GeoColor
Daytime true-color, blue-light/IR sandwich at night
02:05 UTC · Stonybrook, PA · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Stonybrook, PA
Satellite · infrared · animated
Stonybrook, PA
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Stonybrook, PA
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:11 AM
Sunrise
1:43 AM
Daylight
14h 55m
Sunset
4:38 PM
Civil dusk
9:12 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Stonybrook, PA
The moon
Waning Gibbous
77% illuminated
Moonrise
11:24 PM
Moonset
11:16 AM
In sign
♓︎ Pisces
Stonybrook, PA
Microseason
Jul 1–5

Cicadas claim the afternoon

fish
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Stonybrook at a glance

  • Today vs. normal: 8°F above the seasonal normal for this latitude
  • Last frost: April 16 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

16-Day Forecast — Stonybrook

  1. Sat100°75°46%
  2. Sun95°73°58%
  3. Mon80°66°94%
  4. Tue70°66°83%
  5. Wed72°62°19%
  6. Thu89°65°12%
  7. Fri90°70°48%
  8. Sat82°63°30%
  9. Sun80°61°33%
  10. Mon81°56°18%
  11. Tue88°60°18%
  12. Wed82°64°32%
  13. Thu84°61°30%
  14. Fri90°60°29%
  15. Sat84°68°48%
  16. Sun84°70°45%

Forecast data from Open-Meteo (CC BY 4.0).

Right now in the garden

Peak growing season

As of July 5, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.

SPC Convective Outlook

Storm Prediction Center — Stonybrook

SPC has placed Stonybrook in the Slight Risk category for severe thunderstorms today.

  • TODAYSLGTSlight Risk
  • TOMORROWSLGTSlight Risk
  • DAY 3TSTMGeneral Thunderstorms

Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.

Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.

January 1–5: The year turns in silence.January 6–10: Ice thickens on still water.January 11–15: Shortest shadows lengthen.January 16–20: Pheasants begin to call.January 21–25: Springs begin to thaw.January 26–31: Chickadees announce dawn.February 1–5: East wind softens the frost.February 6–10: Sap begins to rise.February 11–15: First snowdrops appear.February 16–20: Red-winged blackbirds return.February 21–25: Rain begins to replace snow.February 26–28: Skunk cabbage pushes through ice.March 1–5: Ice withdraws from the reservoir.March 6–10: Crocuses open to weak sun.March 11–15: Peepers call from the marsh.March 16–20: Woodcocks spiral at dusk.March 21–25: Equinox — light overtakes dark.March 26–31: Forsythia opens along the fences.April 1–5: Cherry blossoms drift like snow.April 6–10: Warblers appear in the understory.April 11–15: Magnolias bloom and fall in a day.April 16–20: Dogwoods float above the forest.April 21–25: Lilacs perfume the evening.April 26–30: Last frost releases the garden.May 1–5: Warblers flood the Ramble.May 6–10: Tulip poplars light their candles.May 11–15: Shad run up the rivers.May 16–20: Roses open along the stoops.May 21–25: Firefly scouts appear at dusk.May 26–31: Strawberries ripen in the sun.June 1–5: Fireflies rise from the lawn.June 6–10: Elderflowers open in hedgerows.June 11–15: Solstice approaches — longest light.June 16–20: Honeysuckle sweetens the night.June 21–25: Solstice — the sun stands still.June 26–30: Lightning bugs drift through oaks.July 1–5: Cicadas claim the afternoon.July 6–10: Queen Anne's lace lines the roads.July 11–15: Thunder builds each afternoon.July 16–20: Corn reaches for the tassels.July 21–25: Dog days settle in the haze.July 26–31: Katydids begin their chorus.August 1–5: Night falls a minute earlier.August 6–10: Sunflowers face the morning.August 11–15: Goldenrod begins to bloom.August 16–20: Crickets pulse through warm nights.August 21–25: First cool morning surprises.August 26–31: Monarchs stage for flight.September 1–5: School buses reappear.September 6–10: Asters purple the roadsides.September 11–15: Hawk migration over the Hudson.September 16–20: Equinox — dark overtakes light.September 21–25: Apples hang heavy on the branch.September 26–30: Geese begin to chevron south.October 1–5: Witch hazel blooms as others fade.October 6–10: Maples begin to blaze.October 11–15: Frost paints the garden black.October 16–20: Oaks turn bronze and russet.October 21–25: Leaves rattle down the gutters.October 26–31: Clocks fall back — dusk at five.November 1–5: Ginkgos drop overnight.November 6–10: Last leaves cling stubbornly.November 11–15: Juncos arrive from the north.November 16–20: Bare branches reveal the sky.November 21–25: First flurries dust the rooftops.November 26–30: Woodsmoke curls through the block.December 1–5: Darkness settles before dinner.December 6–10: Holly and winterberry persist.December 11–15: Shortest day approaches.December 16–20: Ice begins to form at the edges.December 21–25: Solstice — the sun begins return.December 26–31: The year turns in silence.🌱February 14 — First skunk-cabbage spathes thaw their way up☀️March 20 — Spring equinox — day and night balance🌸April 5 — Cherry blossoms peak in the parks🐦May 10 — Warbler migration peaks along the coast✨May 25 — First fireflies scout the meadows at dusk🌞June 21 — Summer solstice — longest day🦗July 25 — Peak cicada chorus in the afternoons🌊August 18 — Warmest sea-surface temperatures of the year🍂September 22 — Autumn equinox — the slow turn❄️October 25 — First widespread frost in the suburbs🍁November 10 — Peak leaf color across the Hudson Valley🌙December 21 — Winter solstice — longest night

Microseason · July 1–5

Cicadas claim the afternoon

Annual cicada buzz begins, peaking in the heat of the day.

Day 186 of 365 · Wedge 37 of 72

The solar year drawn as a wheel of 72 five-day windows. Each wedge is one microseason; the four colored arcs mark winter, spring, summer, and autumn; the small icons sit at notable phenological events. The crimson pointer creeps clockwise as the year turns.

Planting calendar

MonthPlantHarvest
January——
February——
March——
Aprillettuce, peas, spinach, radishes—
Maylettuce, peas, spinach, radishes, tomatoes, peppers, beans, squashlettuce, peas, radishes
Junetomatoes, peppers, beans, squashlettuce, peas, radishes
Julytomatoes, peppers, beans, squashtomatoes, beans, summer squash
August—tomatoes, beans, summer squash
Septemberfall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
Octoberfall brassicas, garlic (overwinter), carrotswinter squash, tomatoes (last)
November——
December——

A year in weather

The year in Stonybrook tops out in July (~77°F) and dips lowest in January (~30°F), with December wettest at 3.8 inches and February driest at 2.7 inches.

MonthMean tempPrecipRainy days
January30°3.1″14
February32°2.7″13
March41°3.4″16
April53°3.7″17
May62°3.8″18
June71°3.6″16
July77°2.9″15
August75°3.5″17
September69°3.3″15
October58°2.8″13
November44°3.6″14
December34°3.8″14

Regional context

Stonybrook swings from 30°F in January to 77°F in July (47°F) per NOAA NCEI 1991-2020 normals; precipitation in Stonybrook runs about 40.2 inches on roughly 182 measurable days.

Stonybrook's precipitation spreads evenly: December peaks at 3.8 inches on 14.2 wet days, while February holds 2.7 inches over 13.0 — no month dominates Stonybrook's rain calendar. That lines Stonybrook up with places like Yorklyn, PA, Hallam, PA and Yorkana, PA, fed by overlapping storm tracks.

Stonybrook reaches its last hard frost near mid-April; that is the cue for kale, peas, spinach, and parsnips. Stonybrook's heat-lovers — tomatoes, peppers, squash — hold off until Stonybrook's frost risk clears, 10-14 days on. The season ends by mid-November in Stonybrook, once hard frosts set back in. A creek-bottom lot in Stonybrook can lag Stonybrook's last frost 7-10 days behind a south slope.

Similar climates: Yorklyn, PA, Hallam, PA, Yorkana, PA, East York, PA, Queens Gate, PA.

Frequently asked

When does it freeze in Stonybrook?
Stonybrook's last spring frost lands near mid-April, and in Stonybrook the first fall frost follows around mid-November.
What is the rainy season in Stonybrook?
Rainfall in Stonybrook peaks in December near 3.8 inches, out of about 40 inches annually.
What is the warmest month in Stonybrook?
On average July tops the year in Stonybrook at about 77°F.
What is the coldest month in Stonybrook?
The coldest stretch in Stonybrook falls in January, around 30°F on average.
When can I start a vegetable garden in Stonybrook?
In Stonybrook, sow peas and hardy greens around mid-April; Stonybrook's tomatoes and peppers wait two weeks more.
How many rainy days does Stonybrook get?
Stonybrook averages about 182 days with measurable rain or snow each year.
What hardiness zone is Stonybrook?
Since January in Stonybrook averages 30°F, Stonybrook's USDA zone follows that floor — confirm it by ZIP.
What is the 10-day forecast for Stonybrook?
Stonybrook's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
Will it rain this week in Stonybrook?
See this week's day-by-day rain chances for Stonybrook in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Stonybrook?
Current conditions for Stonybrook and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Stonybrook forecast updated?
The Stonybrook forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Stonybrook?
Today's sunrise and sunset times for Stonybrook are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
How accurate is the weather forecast for Stonybrook?
The next few days in Stonybrook's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Set in a warm-summer humid continental zone, Stonybrook, Pennsylvania swings from 30°F in the heart of winter to 77°F at midsummer — a 47°F arc.

Stonybrook sees close to 40 inches of precipitation annually, falling across some 182 wet days.

Stonybrook sits at 40.0°N; that 47°F seasonal swing frames planting windows and frost dates across Stonybrook.

All cities in Pennsylvania →

York, PA weather →

ZIP codes in Stonybrook

  • 17402

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.